This is a beta course, so its structure, chapters, and examples may continue to change.物理层 This article is being translated. Please check back soon. Chapters通信基础传输理论编码与调制交换技术传输介质物理层设备练习题Previous计算机网络体系结构练习题计算机网络体系结构相关练习题和参考答案Next通信基础学习通信基础知识，包括信道、信号、带宽、码元、波特、速率等基本概念
